How do I add Slack as a contact method in Canvas as an observer?
If allowed by your student's institution, you may be able to add Slack as a contact method in Canvas. Notifications from Canvas are received via message in the Slack app. You can add your Slack contact from the User Settings sidebar in Other Contacts.
Once you have enabled the contact method, learn how to set notification settings.
Open Account Settings

In Global Navigation, click the Account link [1], then click the Settings link [2].